Insertion Sequence

Insertion sequences are simple procaryotic mobile elements .
Facts
In E. coli, spontaneous mutations in gal and in lac genes occur at 10-5 to 10-7 per generation. The mutations are highly polar. The polarity depends on r -factor .
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Insertion sequence (IS element)
Group of transposable elements that were detected by Saedler, Starling and Shapiro. They constist of 800 to 2000 base pairs and carry inverted repeats at their ends.
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Insertion sequence (IS)
A transposable nucleotide sequence that only encodes the functions required for its own transposition. Insertion sequences are typically less than 5 kb. Synonymous with "insertion element".
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insertion sequence
The simplest kind of a transposon, consisting of inserted repeats of DNA flanking a gene for transposase, the enzyme that catalyzes transposition.
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Insertion Sequence: A small bacterial transposon carrying only the genetic functions involved in transposition. There are usually inverted repeats at the ends of the insertion sequence.
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The selenocysteine insertion sequence (SECIS) has been found in a number of organisms.
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insertion sequence The specific base sequences at either end of a transposon which allows for insertion into DNA. integral membrane proteins Proteins inserted into a membrane by hydrophobic interactions Contrast with peripheral proteins.
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The simplest type of transposon is an insertion sequence (IS). It is a sequence of DNA that encodes an enzyme called transposase, which enables the IS to move.
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Insertion sequences are short (600-1500 base pairs long) simple transposons that do not carry genes beyond those essential for insertion of the transposon into E. coli. Complex transposons are much larger and carry additional genes.
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A general term for any genetic unit that can insert into a chromosome, exit, and relocate; includes insertion sequences, transposons, some bacteriophages, and controlling element.
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Transposons in bacteria are also called insertion sequences. They usually carry an additional gene for a function other than transposase, often an antibiotic resistance.
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